                    &           .&            &            &            &            \\
                    &       count&        mean&          sd&         min&         max\\
Pre-pregnancy asthma             & 1,240,621  & 0.07       & 0.25       & 0 & 1 \\
Pre-pregnancy diabetes           & 1,240,621  & 0.01       & 0.07       & 0 & 1 \\
Pre-pregnancy kidney disease     & 1,240,621  & 0.01       & 0.07       & 0 & 1 \\
Pre-pregnancy hypertension       & 1,240,621  & 0.01       & 0.06       & 0 & 1 \\
Smoked at 12 weeks gestation     & 1,240,621  & 0.09       & 0.29       & 0 & 1 \\
Smoked at 30-32 weeks gestation  & 1,240,621  & 0.07       & 0.27       & 0 & 1 \\
Height                           & 1,240,621  & 166.38     & 6.35       & 100 & 200 \\
Underweight (BMI $<$ 18.5) Prior to Pregnancy & 1,240,621  & 0.02       & 0.15       & 0 & 1 \\
Obese (BMI $\geq$ 30) Prior to Pregnancy      & 1,240,621  & 0.11       & 0.31       & 0 & 1 \\
Percent Twin Births              & 1,240,621  & 2.55       & 15.77      & 0 & 100 \\
Mother's Age in Years            & 1,240,621  & 29.96      & 5.11       & 18 & 49 \\
a                   & 1,240,621  &        1.00&        0.00&        1.00&        1.00\\
